Is the 4.742 MeV state in Sr-88 the 1(-) two-phonon state?

Citation
L. Kaubler et al., Is the 4.742 MeV state in Sr-88 the 1(-) two-phonon state?, EUR PHY J A, 7(1), 2000, pp. 15-18
Citations number
28
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL A
ISSN journal
1434-6001 → ACNP
Volume
7
Issue
1
Year of publication
2000
Pages
15 - 18
Database
ISI
SICI code
1434-6001(200001)7:1<15:IT4MSI>2.0.ZU;2-G
Abstract
A nuclear resonance fluorescence experiment on Sr-88 hits been performed wi th bremsstrahlung of 6.7 MeV endpoint energy. The gamma-ray linear polarisa tion has been measured with a EUROBALL CLUSTER detector used as a Compton p olarimeter. The results indicate positive parity for the J =1 state at 4.74 2 MeV in Sr-88, in contrast to the previous interpretation as a 1(-) two-ph onon (2(1)(+) x 3(1)(-)) state and in conflict with the predictions of the quasiparticle-phonon model. On the basis of such calculations the 1(+) stat e at 3.486 MeV may be considered as the 1(1)(+) one-phonon state and the ve ry strong 1(1)(+) --> 0(1)(+) deexcitation as proton spin-flip 2p(1/2) --> 2p(3/2) transition.